Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin.

ABSTRACT: Organic photodetectors (OPDs) exhibit superior spectral responses but slower photoresponse times compared to inorganic counterparts. Herein, we study the light-intensity-dependent OPD photoresponse time with two small-molecule donors (planar MPTA or twisted NP-SA) co-evaporated with C₆₀ acceptors. MPTA:C₆₀ exhibits the fastest response time at high-light intensities (>0.5 mW/cm²), attributed to its planar structure favoring strong intermolecular interactions. However, this blend exhibits the slowest response at low-light intensities, which is correlated with biphasic photocurrent transients indicative of the presence of a low density of deep trap states. Optical, structural, and energetical analyses indicate that MPTA molecular packing is strongly disrupted

SUBMITTER: Labanti C 

PROVIDER: S-EPMC9243077 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature